/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
Compute the matrix for skeletal Fbx Node If we import don't import a scene it will call ComputeTotalMatrix with Node as the parameter. If we import a scene it will return the relative transform between the RootSkeletalNode and Node.
KFbxXMatrix* The global transform matrix
FbxAMatrix ComputeSkeletalMeshTotalMatrix ( FbxNode * Node, FbxNode * RootSkeletalNode )